package com.wrb.pwd.utils;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5Utils {

	public static final String salt = "777";

	private static String byteArrayToHexString(byte b[]) {
		StringBuffer resultSb = new StringBuffer();
		for (int i = 0; i < b.length; i++) {
			resultSb.append(byteToHexString(b[i]));
		}

		return resultSb.toString();
	}

	//32位大写toUpperCase()
	public static String md5(String string) {
		String re_md5 = new String();
		try {
			MessageDigest md = MessageDigest.getInstance("MD5");
			md.update(string.getBytes());
			byte b[] = md.digest();

			int i;

			StringBuffer buf = new StringBuffer("");
			for (int offset = 0; offset < b.length; offset++) {
				i = b[offset];
				if (i < 0) {
					i += 256;
				}
				if (i < 16) {
					buf.append("0");
				}
				buf.append(Integer.toHexString(i));
			}

			re_md5 = buf.toString().toUpperCase();

		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		}
		return re_md5;

	}

	private static String byteToHexString(byte b) {
		int n = b;
		if (n < 0) {
			n += 256;
		}
		int d1 = n / 16;
		int d2 = n % 16;
		return hexDigits[d1] + hexDigits[d2];
	}

	public static String MD5Encode(String origin, String charsetname) {
		String resultString = null;
		try {
			resultString = new String(origin);
			MessageDigest md = MessageDigest.getInstance("MD5");
			if (charsetname == null || "".equals(charsetname)) {
				resultString = byteArrayToHexString(md.digest(resultString
						.getBytes()));
			} else {
				resultString = byteArrayToHexString(md.digest(resultString
						.getBytes(charsetname)));
			}
		} catch (Exception exception) {
		}
		return resultString;
	}


	public static String convertMD5(String inStr) {
		char[] a = inStr.toCharArray();
		for (int i = 0; i < a.length; i++) {
			a[i] = (char) (a[i] ^ 't');
		}
		String s = new String(a);
		return s;
	}


	private static final String hexDigits[] = {"0", "1", "2", "3", "4", "5",
			"6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};

}